Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

39944D

ICAO 24-bit transponder address · allocated to France

Currently assigned to F-HFCN · EMBRAER ERJ-145

Hex
39944D
Octal
16312115
Decimal
3,773,517
Country
FR
Tail
F-HFCN
Type
E145
No current signal · last broadcast 5d ago
Flights observed
78
Distinct callsigns
20
Country
FR
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 39944D.

Country allocation

The ICAO 24-bit address 39944D falls within the block assigned to France (FR) by ICAO Annex 10, Volume III. Every aircraft registered in France receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
TLJ859V - 6 2026-06-26
TLJ871B - 4 2026-06-29
TLJ839C - 4 2026-05-08
TLJ800G - 4 2026-07-08
TLJ340F - 4 2026-06-20
TLJ117Z - 4 2026-05-18
TLJ721U - 3 2026-06-14
TLJ680B - 3 2026-06-23
TLJ425P - 3 2026-06-17
TLJ390E - 3 2026-05-10
TLJ368H - 3 2026-05-03
TLJ207B - 3 2026-07-05
TLJ202Z - 3 2026-04-18
TLJ188E - 3 2026-06-22
TLJ185S - 3 2026-07-04
VLJ890X - 2 2026-04-16
VLJ202Z - 2 2026-04-16
TLJ974S - 2 2026-07-03
TLJ780X - 2 2026-07-06
TLJ658Q - 2 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 TLJ468C VIE → LBG Jul 12, 09:35 UTCJul 12, 11:25 UTC1h 50m
2026-07-11 TLJ468C - Jul 11, 08:55 UTCJul 11, 10:30 UTC1h 35m
2026-07-08 TLJ800G - Jul 8, 18:30 UTCJul 8, 19:05 UTC35m
2026-07-08 TLJ800G - Jul 8, 16:15 UTCJul 8, 17:15 UTC1h 0m
2026-07-07 TLJ800G LBG → ZRH Jul 7, 08:30 UTCJul 7, 09:20 UTC50m
2026-07-07 TLJ800G - Jul 7, 06:40 UTCJul 7, 07:25 UTC45m
2026-07-06 TLJ780X - Jul 6, 15:55 UTCJul 6, 17:30 UTC1h 35m
2026-07-06 TLJ780X - Jul 6, 12:20 UTCJul 6, 14:25 UTC2h 5m
2026-07-05 TLJ207B - Jul 5, 08:00 UTCJul 5, 08:55 UTC55m
2026-07-05 TLJ207B - Jul 5, 06:10 UTCJul 5, 06:45 UTC35m
2026-07-04 TLJ185S WRO → LBG Jul 4, 20:00 UTCJul 4, 21:40 UTC1h 40m
2026-07-04 VLJ207B CFE → WRO Jul 4, 12:30 UTCJul 4, 14:15 UTC1h 45m
2026-07-04 TLJ207B - Jul 4, 10:15 UTCJul 4, 11:15 UTC1h 0m
2026-07-04 TLJ185S - Jul 4, 07:50 UTCJul 4, 09:10 UTC1h 20m
2026-07-04 TLJ185S - Jul 4, 05:15 UTCJul 4, 06:55 UTC1h 40m
2026-07-03 TLJ573M BQH → LBG Jul 3, 13:45 UTCJul 3, 14:35 UTC50m
2026-07-03 TLJ573M - Jul 3, 12:05 UTCJul 3, 12:45 UTC40m
2026-07-03 TLJ974S BQH → LBG Jul 3, 10:10 UTCJul 3, 10:55 UTC45m
2026-07-01 TLJ974S - Jul 1, 11:35 UTCJul 1, 12:20 UTC45m
2026-06-29 TLJ871B BCN → LBG Jun 29, 13:59 UTCJun 29, 15:30 UTC1h 30m
2026-06-29 TLJ871B - Jun 29, 10:50 UTCJun 29, 12:09 UTC1h 20m
2026-06-29 TLJ871B - Jun 29, 09:14 UTCJun 29, 10:00 UTC45m
2026-06-29 TLJ871B - Jun 29, 07:09 UTCJun 29, 07:34 UTC25m
2026-06-26 TLJ859V - Jun 26, 13:04 UTCJun 26, 13:59 UTC55m
2026-06-26 TLJ859V - Jun 26, 10:50 UTCJun 26, 12:10 UTC1h 20m
2026-06-26 TLJ859V - Jun 26, 07:39 UTCJun 26, 08:50 UTC1h 10m
2026-06-23 TLJ680B - Jun 23, 09:29 UTCJun 23, 10:49 UTC1h 20m
2026-06-23 TLJ680B RTM → SZG Jun 23, 06:39 UTCJun 23, 07:49 UTC1h 10m
2026-06-23 TLJ680B CDG → RTM Jun 23, 04:35 UTCJun 23, 05:09 UTC35m
2026-06-22 TLJ188E BCN → LBG Jun 22, 16:10 UTCJun 22, 17:34 UTC1h 25m
2026-06-22 TLJ188E - Jun 22, 12:15 UTCJun 22, 13:59 UTC1h 45m
2026-06-22 TLJ188E - Jun 22, 11:19 UTCJun 22, 11:39 UTC20m
2026-06-21 TLJ410Z - Jun 21, 00:10 UTCJun 21, 01:55 UTC1h 45m
2026-06-20 TLJ340F - Jun 20, 15:09 UTCJun 20, 16:39 UTC1h 30m
2026-06-20 TLJ340F BCN → RTM Jun 20, 12:30 UTCJun 20, 14:14 UTC1h 45m
2026-06-19 TLJ340F RTM → BCN Jun 19, 06:39 UTCJun 19, 08:34 UTC1h 55m
2026-06-19 TLJ340F - Jun 19, 05:00 UTCJun 19, 05:40 UTC40m
2026-06-17 TLJ425P - Jun 17, 15:05 UTCJun 17, 16:50 UTC1h 45m
2026-06-17 TLJ425P - Jun 17, 11:50 UTCJun 17, 12:45 UTC55m
2026-06-17 TLJ425P - Jun 17, 09:40 UTCJun 17, 10:35 UTC55m
2026-06-14 TLJ859V - Jun 14, 13:40 UTCJun 14, 14:55 UTC1h 15m
2026-06-14 TLJ859V - Jun 14, 11:45 UTCJun 14, 13:05 UTC1h 20m
2026-06-14 TLJ859V - Jun 14, 10:10 UTCJun 14, 11:00 UTC50m
2026-06-14 TLJ721U - Jun 14, 01:05 UTCJun 14, 01:20 UTC15m
2026-06-13 TLJ721U - Jun 13, 23:15 UTCJun 14, 00:15 UTC1h 0m
2026-06-12 TLJ721U - Jun 12, 16:15 UTCJun 12, 17:15 UTC1h 0m
2026-06-10 TLJ175G - Jun 10, 12:10 UTCJun 10, 13:25 UTC1h 15m
2026-05-25 TLJ447J - May 25, 12:40 UTCMay 25, 13:30 UTC50m
2026-05-20 TLJ412Z - May 20, 16:35 UTCMay 20, 18:20 UTC1h 45m
2026-05-18 TLJ117Z - May 18, 12:10 UTCMay 18, 13:25 UTC1h 15m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the F-HFCN page for operator, model, and routing details .

Mode-S 39944D frequently asked

What is Mode-S code 39944D?
39944D is an ICAO 24-bit transponder address. Allocated to France. Assigned to F-HFCN.
Where is Mode-S 39944D registered?
Mode-S code 39944D is allocated to France (FR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 39944D broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 39944D, octal 16312115, decimal 3,773,517.
What flights does 39944D operate?
Mode-S 39944D has broadcast 20 distinct callsigns, including TLJ859V, TLJ871B, TLJ839C, TLJ800G, TLJ340F.